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Finding the Fourth Proportional to 1,562.11, 2,155.71 and 853.96

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Solution

The fourth proportional to 1,562.11, 2,155.71 and 853.96 is: 1,178.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,562.11 : 2,155.71 = 853.96 : x
  2. Step 2: Convert to fraction form
    1,562.11/2,155.71 = 853.96/x
  3. Step 3: Cross multiply
    1,562.11x = 2,155.71 × 853.96
  4. Step 4: Simplify right side
    1,562.11x = 1,840,884.72
  5. Step 5: Solve for x
    x = 1,840,884.72/1,562.11
  6. Step 6: Final answer
    x = 1,178.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.